Your statement "professional-looking results", may be a problem.
Professional-looking results is more a product of the person holding the camera than the camera itself.

You should find out what it will cost for a professional photographer to do the job.

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It will be helpful to have a camera that has a wide angle lens and gives you some control over the camera.

For the inside shots you can not use flash because most small cameras have a very limited flash coverage range.
So you are going to need a tripod to support the camera, because you will be shooting with available light; which means you will be using some very slow shutter speeds.

You will likely have to set the camera's white balance to match the artificial lighting used in the office.

Avoid having any outside wall windows in the shot, as they will complicate the lighting and exposure.

I would suggest you look at the Fujifilm S1600 or S1800.
They were announced on Feb 10, 2010, so they may not be in all camera stores right now.
They are an update to the older S1500.
But don't get the S1500 because it does not have the wide angle lens.

http://www.dpreview.com/reviews/compare_post.asp?method=sidebyside&cameras=fujifilm_s1600%2Cfujifilm_s1800&show=all

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